it's actually a due to a research field created/popularized by Tolkien
https://en.wikipedia.org/wiki/Phonaesthetics
all about studying pleasant sounding words, big pharma uses it for naming drugs. "Cellar door" was one of Tolkien's favorite phrases, you can see variations and modifications of it in many fantasy settings
Tolkien, Lewis, and others have suggested that cellar door's auditory beauty becomes more apparent the more the word is dissociated from its literal meaning, for example, by using alternative spellings such as Selador, Selladore, Celador, Selidor
I'm really surprised at what a challenge that turned out to be. I was certain I was gonna have no problems distinguishing drugs from Tolkien characters, but I only got 15/24 in the end. Recognized a few obvious brand names and characters, but half the time I had to resort to straight-up guessing. Some of those drug names totally sound like Tolkien characters.